4 releases
0.1.3 | May 2, 2019 |
---|---|
0.1.2 | May 2, 2019 |
0.1.1 | May 2, 2019 |
0.1.0 | May 1, 2019 |
#867 in Unix APIs
2,155 downloads per month
Used in 4 crates
15KB
168 lines
stdio-override
A Rust library to easily override Stdio file descriptors in Rust
Usage
Add this to your Cargo.toml
:
[dependencies]
stdio-override = "0.1"
and for Rust Edition 2015 add this to your crate root:
extern crate stdio_override;
In Rust Edition 2018 you can simply do:
use stdio_override::*;
Here's an example on how to write stdout into a file:
use std::{fs::read_to_string, io};
use stdio_override::StdoutOverride;
fn main() -> io::Result<()> {
let file_name = "./readme_test.txt";
let guard = StdoutOverride::override_file(file_name)?;
println!("12345");
drop(guard);
let contents = read_to_string(file_name)?;
assert_eq!("12345\n", contents);
println!("Outside!");
Ok(())
}
You can do the same with sockets:
use std::{
io::Read,
net::{TcpListener, TcpStream},
};
use stdio_override::StdoutOverride;
fn main() {
let address = ("127.0.0.1", 5543);
let listener = TcpListener::bind(address).unwrap();
let socket = TcpStream::connect(address).unwrap();
let guard = StdoutOverride::override_raw(socket).unwrap();
println!("12345");
drop(guard);
let mut contents = String::new();
let (mut stream, _) = listener.accept().unwrap();
stream.read_to_string(&mut contents).unwrap();
assert_eq!("12345\n", contents);
println!("Outside!");
}
Both will work the same for Stderr
and if you want to input Stdin
from a file/socket you can do the following:
use std::{fs::{File, read_to_string}, io::{self, Write}};
use stdio_override::StdinOverride;
fn main() -> io::Result<()> {
let file_name = "./test_inputs.txt";
{
let mut file = File::create(&file_name)?;
file.write_all(b"Data")?;
}
let guard = StdinOverride::override_file(file_name)?;
let mut inputs = String::new();
io::stdin().read_line(&mut inputs)?;
drop(guard);
assert_eq!("Data", inputs);
// Stdin is working as usual again, because the guard is dropped.
Ok(())
}
Dependencies
~45KB